Electric assembly and vehicle having the same

ABSTRACT

An electric assembly includes: a box assembly, a motor, and a transmission. A mounting plate is disposed in the box assembly and divides a space within the box assembly into a motor holding cavity and a transmission holding cavity arranged along an axial direction of a motor shaft. The mounting plate has a shaft via-hole making the motor holding cavity and the transmission holding cavity be in communication. The motor is disposed in the motor holding cavity. The transmission is disposed in the transmission holding cavity. The motor is power-coupled to the transmission. At least one of a surface of the mounting plate facing the motor and a surface of the mounting plate facing the transmission is provided with ribs including strip-shaped ribs extending along a radial direction of the motor. Heights of the strip-shaped ribs decrease from a center portion of the mounting plate to a periphery portion of the mounting plate.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation application of U.S. patentapplication Ser. No. 16/969,163, filed on Aug. 11, 2020, which is anational phase entry under 35 U.S.C. § 371 of International PatentApplication No. PCT/CN2019/073415, filed on Jan. 28, 2019, which isbased on and claims priority to and benefits of Chinese PatentApplications No. 201810146443.X and 201820254940.7, both filed on Feb.12, 2018. The content of all of the above-identified applications isincorporated herein by reference in their entirety.

FIELD

The present invention relates to the field of vehicle manufacturingtechnologies and, specifically, to an electric assembly and a vehiclehaving the electric assembly.

BACKGROUND

A motor assembly, a transmission assembly, and a controller assemblyindividually disposed are used in a vehicle in the related art. Themotor assembly and the transmission assembly are connected togetherthrough a bolt. Box assemblies at connection locations have relativelylarge wall thicknesses and waste space; there are many and bulkycomponents; the loss is high; each assembly occupies a relatively largespace; the structure is insufficiently compact; and mounting andmaintenance are difficult. Thus, costs are relative relatively high, andthe entire mass is large, which affects the endurance capability of theentire vehicle.

SUMMARY

The present disclosure aims to resolve at least one of the technicalproblems existing in the prior art. For this purpose, the presentdisclosure proposes an electric assembly, where the electric assemblyhas advantages such as a compact structure and a high integration level.

The present disclosure further provides a vehicle having the electricassembly.

To achieve the foregoing objective, according to an embodiment of afirst aspect of the present disclosure, an electric assembly isproposed. The electric assembly includes: a box assembly, where amounting plate is disposed in the box assembly, the mounting platedivides a space within the box assembly into a motor holding cavity anda transmission holding cavity that are arranged along an axial directionof a motor shaft, and the mounting plate has a shaft via-hole making themotor holding cavity and the transmission holding cavity be incommunication with each other; a motor, where the motor is disposed inthe motor holding cavity; and a transmission, where the transmission isdisposed in the transmission holding cavity, and the motor ispower-coupled to the transmission.

Additionally, the electric assembly according to the foregoingembodiment of the present disclosure may further have the followingadditional technical characteristics.

According to an embodiment of the present disclosure, at least one of asurface of the mounting plate facing the motor and a surface of themounting plate facing the transmission is provided with ribs.

According to an embodiment of the present disclosure, the ribs divide aspace between the mounting plate and the motor into a plurality ofcavities.

According to an embodiment of the present disclosure, a maximum distancebetween the motor and the mounting plate is less than a preset distance.

According to an embodiment of the present disclosure, the ribs includean annular rib extending along a circumferential direction of the motor.

According to another embodiment of the present disclosure, the ribsinclude strip-shaped ribs extending along a radial direction of themotor, the strip-shaped ribs are spaced apart along a circumferentialdirection of the mounting plate.

According to an embodiment of the present disclosure, heights of atleast a part of the strip-shaped ribs relative to the mounting plategradually decrease from a center portion of the mounting plate to aperiphery portion of the mounting plate.

According to an embodiment of the present disclosure, the box assemblyincludes a transmission box and a motor box, the transmission boxincludes a front box and a rear box, the motor box includes a motorhousing and a motor backend cover, the front box and the motor housingare disposed adjacent to each other, and the mounting plate is a part ofthe front box or a part of the motor housing.

According to an embodiment of the present disclosure, the front box andthe motor housing are integrally formed or detachably connected.

According to an embodiment of the present disclosure, the box assemblyincludes a transmission box and a motor box, the transmission boxincludes a front box and a rear box, the motor box includes a motorfrontend cover, a motor housing and a motor backend cover, and themounting plate is a part of the front box or a part of the motorfrontend cover.

According to another embodiment of the present disclosure, the motorfrontend cover and the front box are integrally formed, and the motorhousing and the motor frontend cover are detachably connected.

According to an embodiment of the present disclosure, one or more of afirst connection rib, a second connection rib and a third connection ribare connected between an outer surface of the front box and an outersurface of the motor housing, the first connection rib is connectedbetween an upper end face of the outer surface of the motor housing andan upper end face of the outer surface of the front box, the secondconnection rib is connected between a lower end face of the outersurface of the motor housing and a lower end face of the outer surfaceof the front box, and the third connection rib is located between thefirst connection rib and the second connection rib.

According to an embodiment of the present disclosure, the electricassembly further includes a bearing, where the bearing is sleeved overthe motor shaft and is located between the motor shaft and a motorhousing.

According to an embodiment of the present disclosure, the bearing islocated between a main shaft of the transmission and a stator of themotor in the axial direction of the motor shaft.

According to an embodiment of the present disclosure, the electricassembly further includes a plurality of bearings including the bearing,where the plurality of bearings are respectively sleeved over the motorshaft and the main shaft and are spaced apart along the axial directionof the motor shaft.

According to an embodiment of the present disclosure, the plurality ofbearings include a first bearing, a second bearing, and a third bearing,the first bearing and the second bearing are respectively disposedadjacent to two ends of the main shaft, and the third bearing isdisposed adjacent to one end of the motor shaft away from the mainshaft.

According to an embodiment of the present disclosure, the third bearingis disposed between the box assembly and one end of the motor shaft awayfrom the transmission, the first bearing is disposed between the boxassembly and one end of the main shaft away from the motor, and thesecond bearing is disposed between the box assembly and at least one ofone end of the motor shaft close to the main shaft and one end of themain shaft close to the motor shaft.

According to an embodiment of the present disclosure, the second bearingis sleeved over the main shaft and is located on an overlap between themain shaft and the motor shaft in the axial direction of the motorshaft.

According to another embodiment of the present disclosure, the electricassembly further includes a fourth bearing, where the fourth bearing issleeved over the motor shaft and is located between the motor shaft andthe motor housing in the axial direction of the motor shaft.

According to an embodiment of the present disclosure, the fourth bearingis located between the main shaft of the transmission and a stator ofthe motor.

According to an embodiment of the present disclosure, an outer surfaceof the motor housing is provided with reinforcing ribs arranged alongthe outer surface of the motor housing.

According to an embodiment of a second aspect of the present disclosure,a vehicle is proposed. The vehicle includes the electric assemblyaccording to the embodiment of the first aspect of the presentdisclosure.

In the vehicle according to this embodiment of the present disclosure,the electric assembly according to the embodiment of the first aspect ofthe present disclosure is used, where the electric assembly hasadvantages such as a compact structure and a high integration level.

The additional aspects and advantages of the present disclosure will beprovided in the following description, and some of the additionalaspects and advantages will become clear in the following description orbe understood through practice of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing and/or additional aspects and advantages of the presentdisclosure become clearer and easily understood in descriptions of theembodiments with reference to the following accompanying drawings.

FIG. 1 is a schematic structural diagram of an electric assemblyaccording to an embodiment of the present disclosure;

FIG. 2 is a local cross-sectional view of an electric assembly accordingto an embodiment of the present disclosure;

FIG. 3 is an enlarged diagram of a location D in FIG. 2 ;

FIG. 4 is an exploded view of an electric assembly according to anembodiment of the present disclosure;

FIG. 5 is an exploded view of a box assembly of an electric assemblyaccording to an embodiment of the present disclosure;

FIG. 6 is a schematic local structural diagram of an electric assemblyaccording to an embodiment of the present disclosure;

FIG. 7 is a local cross-sectional view of an electric assembly accordingto an embodiment of the present disclosure;

FIG. 8 is a local cross-sectional view of an electric assembly accordingto another embodiment of the present disclosure;

FIG. 9 is a schematic structural diagram of an electric assemblyaccording to an embodiment of the present disclosure;

FIG. 10 is a schematic structural diagram of an electric assemblyaccording to an embodiment of the present disclosure;

FIG. 11 is a schematic local structural diagram of an electric assemblyaccording to another embodiment of the present disclosure;

FIG. 12 is a schematic local structural diagram of an electric assemblyaccording to another embodiment of the present disclosure; and

FIG. 13 is a schematic structural diagram of a vehicle according to anembodiment of this application.

Reference numerals of the accompanying drawing: electric assembly 1; boxassembly 100; transmission box 101; motor box 102; motor holding cavity110; transmission holding cavity 120; shaft via-hole 130; motor housing140; reinforcing rib 141; front box 180; first connection rib 181;second connection rib 182; third connection rib 183; rear box 190; motorbackend cover 150; motor frontend cover 170; mounting plate 160;strip-shaped rib 161; cavity 162; annular rib 163; motor 200; motorshaft 210; outer spline 211; main shaft 300; shaft hole 310; innerspline 311; oil baffle 320; oil storage cavity 330; seal retainer ring340; air vent 350; transmission 400; first gear 410; second gear 420;third gear 430; differential assembly 440; transmission shaft 450; firstbearing 510; second bearing 520; third bearing 530; fourth bearing 540;vehicle 10.

DETAILED DESCRIPTION

The following describes embodiments of the present disclosure in detail.Examples of the embodiments are shown in the accompanying drawings. Thesame or similar elements and the elements having same or similarfunctions are denoted by like reference numerals throughout thedescriptions. The following embodiments described with reference to theaccompanying drawings are exemplary, and are only to describe thepresent disclosure and cannot be construed as limiting the presentdisclosure.

An electric assembly according to an embodiment of the presentdisclosure is described below with reference to the accompanyingdrawings.

As shown in FIG. 1 to FIG. 13 , the electric assembly 1 according tothis embodiment of the present disclosure includes a box assembly 100, amotor 200, and a transmission 400.

An mounting plate 160 is disposed in the box assembly 100, the mountingplate 160 divides a space within the box assembly 100 into a motorholding cavity 110 and a transmission holding cavity 120 that arearranged along an axial direction of a motor shaft 210, and the mountingplate 160 has a shaft via-hole 130 making the motor holding cavity 110and the transmission holding cavity 120 be in communication with eachother. The motor 200 is disposed in the motor holding cavity 110. Thetransmission 400 is disposed in the transmission holding cavity 120, andthe motor 200 is power-coupled to the transmission 400.

In the electric assembly 1 according to this embodiment of the presentdisclosure, the motor 200 and the transmission 400 are disposed in thebox assembly 100. Compared with the motor assembly in the related art inwhich the front box of the transmission and the frontend cover of themotor are connected, the motor 200 and the transmission 400 share a boxassembly 100, to implement the integrated design of the electricassembly 1, which not only may leave out a structure in which aplurality of box assemblies 100 are disposed, but also may leave out abolt required to connect the motor assembly and the transmissionassembly, so as to simplify the structure of the electric assembly 1,reduce the part quantity of the electric assembly 1, improve theintegration level of the electric assembly 1, and improve the productionefficiency of the electric assembly 1.

Moreover, the motor 200 and the transmission 400 share a box assembly100. Compared with the related art in which the motor assembly and thetransmission assembly are individually disposed, space may be saved, tohelp shorten an axial distance of the electric assembly 1, so that thestructure of the electric assembly 1 is compact and proper, therebyimproving the space utilization of the electric assembly 1, andfacilitating the disposition of the electric assembly 1; andfacilitating mounting and repair of the electric assembly 1, and helpingimprove reliability and stability of the electric assembly 1.

Moreover, the motor 200 and the transmission 400 share a box assembly100, and therefore components used for integration of the motor 200 andthe transmission 400 may be reduced, thereby helping reduce the weightof the electric assembly 1. For example, when the electric assembly 1 isapplied to a vehicle 10, the entire weight of the vehicle 10 may bereduced, thereby helping reduce costs of the vehicle 10, reducing theenergy loss of the vehicle 10, improving the operating efficiency of thevehicle 10, and improving the endurance capability of the vehicle 10.

Moreover, the box assembly 100 is disposed, the mounting plate 160 isdisposed in the box assembly 100, and clamping needs to be performedonly once during assembly, to facilitate assembly and forming of theelectric assembly 1, help reduce the error of the electric assembly 1,facilitate mounting and disposition of the motor 200 and thetransmission 400, help improve coaxiality and radial mounting accuracyof the motor 200 and the transmission 400, and help improve theoperating performance of the electric assembly 1.

Therefore, the electric assembly 1 according to this embodiment of thepresent disclosure has advantages such as a compact structure and a highintegration level.

An electric assembly 1 according to a specific embodiment of the presentdisclosure is described below with reference to the accompanyingdrawings.

In some specific embodiments of the present disclosure, as shown in FIG.1 to FIG. 13 , the electric assembly 1 according to this embodiment ofthe present disclosure includes a box assembly 100, a motor 200, and atransmission 400.

Specifically, as shown in FIG. 9 and FIG. 10 , a surface of the mountingplate 160 facing the motor 200 is provided with ribs. Because the ribsenhance the rigidity of the box assembly 100 and improve the naturalfrequency, resonance may be prevented from occurring in the electricassembly 1, to help reduce the noise of the electric assembly 1.

More specifically, the ribs divide a space between the mounting plate160 and the motor 200 into a plurality of cavities 162. In this way,forming of the cavities 162 is facilitated, so as to cool the motor 200by using air passing through the cavities 162.

In an embodiment, a maximum distance between the motor 200 and themounting plate 160 is less than a preset distance. It should beunderstood herein that, the preset distance is a maximum distance makingthe mounting plate 160 cool the motor 200. For example, the maximumdistance between the motor 200 and the mounting plate 160 may be lessthan 10 millimeters, and is preferably 7.5 millimeters. Because thepreset value may be set to a relatively small value, the distancebetween the motor 200 and the mounting plate 160 is very small. In thisway, the motor 200 and the mounting plate 160 may be cooled at a shortdistance between each other, and after the mounting plate 160 is cooled,the motor 200 can be quickly cooled.

According to an embodiment of the present disclosure, the mounting plate160 is constructed as a part of a front box 180, and because lubricatingliquid in the transmission cools the front box 180, the mounting plate160 and the box assembly 100, for example, a motor housing 140 and atransmission box 101 may also be cooled. The cavities 162 are formedbetween the ribs of the mounting plate 160, and therefore, the airflowing through the cavities 162 is also cooled accordingly, and themotor 200 may be cooled by using the air flowing through the cavities162, to help improve the heat dissipation performance of the electricassembly 1. In short, the lubricating liquid passing through thetransmission 400 may cool the motor housing 140 and the housing of thetransmission 400 at the same time.

According to another embodiment of the present disclosure, the mountingplate 160 is constructed as a part of the motor housing 140, and becauselubricating liquid in the motor cools the motor housing 140, and mayalso cool the mounting plate 160 and transfer heat through the mountingplate 160, so that the transmission box 101 may also be cooled, therebycooling the box assembly 100 and improving the entire cooling effect ofthe electric assembly 1. In short, the lubricating liquid passingthrough the motor 200 may also cool the motor housing 140 and thetransmission 400 at the same time.

Specifically, during rotation of the motor 200, a stress is transferredto the box assembly 100 through a bearing, and ribs are added to the boxassembly 100, to help increase rigidity and strength of the box assembly100, prevent the box assembly 100 from being in contact with a coil ofthe motor 200, prevent components of the motor 200 from being damaged,and further improve operating reliability and stability of the motor200.

According to an embodiment of the present disclosure, as shown in FIG.12 , the ribs include an annular rib 163 extending along acircumferential direction of the motor 200. In this way, rigidity andstrength of the box assembly 100 may be improved, the structurestability of the box assembly 100 may be improved, and the heatdissipation capability and the cooling effect of the box assembly 100may be improved.

According to another embodiment of the present disclosure, as shown inFIG. 10 , the ribs include strip-shaped ribs 161 extending along aradial direction of the motor 200, there are a plurality of strip-shapedribs 161 and the plurality of strip-shaped ribs 161 are spaced apartalong a circumferential direction of the mounting plate 160. In thisway, a more even force may be applied to the box assembly 100, tofurther help improve rigidity and strength of the box assembly 100,further help improve noise reduction performance and heat dissipationperformance of the electric assembly 1, and improve the cooling effectof the electric assembly 1.

According to another embodiment of the present disclosure, the ribsinclude an annular rib 163 extending along a circumferential directionof the motor 200 and strip-shaped ribs 161 extending along a radialdirection of the motor 200, there are a plurality of strip-shaped ribs161 and the plurality of strip-shaped ribs 161 are spaced apart along acircumferential direction of the mounting plate 160. In this way,rigidity and strength of the box assembly 100 along the circumferentialdirection and the radial direction of the motor 200 may be improved atthe same time, thereby improving the structure reliability of the boxassembly 100, further improving the heat dissipation area of the boxassembly 100, and improving heat dissipation and cooling performance ofthe electric assembly 1.

Specifically, heights of the strip-shaped ribs 161 relative to themounting plate 160 gradually decrease from a center portion of themounting plate to a periphery portion of the mounting plate. In thisway, the disposition space of the strip-shaped ribs 161 may be reduced,to prevent the strip-shaped ribs 161 from occupying excessive space inthe box assembly 100, and further facilitate mounting and disposition ofthe motor 200 and the transmission 400. On the other hand, the heightsof the strip-shaped ribs 161 relative to the mounting plate 160gradually decrease from a center portion of the mounting plate to aperiphery portion of the mounting plate, and the center has a largestheight, and may bear a high strength load formed by a bearing on the boxassembly 100.

According to an embodiment of the present disclosure, the box assembly100 includes a transmission box 101 and a motor box 102, thetransmission box 101 includes a front box 180 and a rear box 190, themotor box 102 includes a motor housing 140 and a motor backend cover150, the front box 180 and the motor housing 140 are disposed adjacentto each other, and the mounting plate 160 is constructed as a part ofthe front box 180 or a part of the motor housing 140. In this way, it isconvenient for the electric assembly 1 to become a three-segmentstructure, forming of the transmission holding cavity 120 and the motorholding cavity 110 is facilitated, and mounting and dismounting of theelectric assembly 1 are facilitated. Moreover, the mounting plate 160 isa part of the front box 180 or a part of the motor housing 140, and themounting plate 160 is integrated on the box assembly 100, so that thestructure of the box assembly 100 may be made more proper and compact,and the mounting plate 160 may be cooled by the lubricating liquid ofthe transmission 400, thereby improving the lubricating and coolingeffect of the mounting plate 160.

Further, the front box 180 and the motor housing 140 are integrallyformed or detachably connected. In this way, the electric assembly 1 maybe a three-segment structure, to facilitate the disposition of the motor200 and the transmission 400.

According to another embodiment of the present disclosure, as shown inFIG. 9 and FIG. 10 , the box assembly 100 includes a transmission box101 and a motor box 102, the transmission box 101 includes a front box180 and a rear box 190, the motor box 102 includes a motor frontendcover 170, a motor housing 140 and a motor backend cover 150, and themounting plate 160 is constructed as a part of the front box 180 or apart of the motor frontend cover 170. In this way, it is convenient forthe electric assembly 1 to become a three-segment structure, forming ofthe transmission holding cavity 120 and the motor holding cavity 110 isfacilitated, and mounting and dismounting of the electric assembly 1 arefacilitated. Moreover, the mounting plate 160 is a part of the front box180 or a part of the motor housing 140, and the mounting plate 160 isintegrated on the box assembly 100, so that the structure of the boxassembly 100 may be made more proper and compact, and the mounting plate160 may be cooled by the lubricating liquid of the transmission 400,thereby improving the lubricating and cooling effect of the mountingplate 160.

According to an embodiment of the present disclosure, as shown in FIG. 2, the motor housing 140, the motor frontend cover 170 and the front box180 are integrally formed or each two of the motor housing 140, themotor frontend cover 170 and the front box 180 are detachably connected.In this way, the structure flexibility of the box assembly may beimproved, to facilitate optimization of the structure of the boxassembly 100, facilitate reduction of the weight of the box assembly100, and improve the endurance capability of the electric assembly 1.

According to another embodiment of the present disclosure, the motorfrontend cover 170 and the front box 180 are integrally formed, and themotor housing 140 and the motor frontend cover 170 are detachablyconnected. In this way, simplification of the assembly process of thebox assembly 100 is facilitated, thereby improving the assemblyefficiency of the box assembly 100.

According to another embodiment of the present disclosure, the motorfrontend cover 170 and the motor housing 140 are integrally formed, andthe motor frontend cover 170 and the front box 180 are detachablyconnected. In this way, mutual separation between the transmission box101 and motor box 102 is facilitated, to help improve the structureflexibility of the box assembly 100.

According to another embodiment of the present disclosure, the motorhousing 140 is connected to the motor frontend cover 170 through a bolt,the motor frontend cover 170 is connected to the front box 180 through abolt, and the motor housing 140 is connected to the motor backend cover150 through a bolt. In this way, machining and forming of the motorhousing 140, the motor frontend cover 170, the front box 180 and therear box 190 are facilitated, so as to simplify the forming process.Because each of the motor frontend cover 170, the motor housing 140 andthe motor backend cover 150 is detachable, the length of the motor 200may be adjusted. For example, the length of the motor housing 140 as astandard member may be individually adjusted, thereby improving thestructure flexibility and the application range of the motor 200.

Specifically, As shown in FIG. 9 , one or more of a first connection rib181, a second connection rib 182 and a third connection rib 183 areconnected between an outer surface of the front box 180 and an outersurface of the motor housing 140, the first connection rib 181 isconnected between (an up-down direction is shown by an arrow A in FIG. 9) an upper end face of the outer surface of the motor housing 140 and anupper end face of the outer surface of the front box 180, the secondconnection rib 182 is connected between a lower end face of the outersurface of the motor housing 140 and a lower end face of the outersurface of the front box 180, and the third connection rib 183 islocated between the first connection rib 181 and the second connectionrib 182. In this way, the strength of connection between the front box180 and the motor housing 140 may be reinforced, to avoid a case inwhich a point with weak strength occurs in a connection location betweenthe front box 180 and the motor housing 140 to cause deformation ordamage, thereby improving the entire structure performance of the boxassembly 100.

In an embodiment, as shown in FIG. 3 , the transmission 400 includes amain shaft 300, the main shaft 300 is power-coupled to a motor shaft 210of the motor 200, at least one of the motor shaft 210 and the main shaft300 is threaded through a shaft via-hole 130 and is connected to theother one, and the main shaft 300 is connected to the motor shaft 210 ofthe motor 200 through splines. In this way, direct transmission betweenthe motor shaft 210 and the main shaft 300 is facilitated, and anadditional transmission structure may be left out, to further simplifythe structure of the electric assembly 1, improve the integration levelof the electric assembly 1, help transfer power outputted by the motor200 to the transmission 400 in time, help improve the transmissionefficiency of the electric assembly 1, and help improve timeliness andaccuracy of power transmission of the electric assembly 1. In this way,the main shaft 300 and the motor shaft 210 may be fixed and positionedby using splines, to prevent relative rotation from occurring betweenthe main shaft 300 and the motor shaft 210, facilitate reliabletransmission of the electric assembly 1, and help ensure transmissionefficiency of the electric assembly 1. In this way, another structureconnecting the main shaft 300 and the motor shaft 210 may be left out,thereby further simplifying the structure of the electric assembly 1,and improving the integration level of the electric assembly 1, andbecause the main shaft 300 and the motor shaft 210 are sleeved over eachother, the shaft spacing of the electric assembly 1 is furthershortened, so as to further control the size of the electric assembly 1in the axial direction of the motor shaft 210.

Further, as shown in FIG. 2 , the main shaft 300 is provided with ashaft hole 310, an inner circumferential surface of the shaft hole 310is provided with inner splines 311, an outer circumferential surface ofthe motor shaft 210 is provided with outer splines 211, the motor shaft210 of the motor 200 is matched in the shaft hole 310 and the innersplines 311 match the outer splines 211. In this way, machining of theinner splines 311 is facilitated, to help improve machining precision ofthe inner splines 311. Through the matching between the inner splines311 and the outer splines 211, transmission connection between the mainshaft 300 and the motor shaft 210 may be implemented, and reliablepositioning between the main shaft 300 and the motor shaft 210 may beimplemented, to further prevent relative rotation from occurring betweenthe main shaft 300 and the motor shaft 210. Moreover, the motor 200 is athree-segment motor, the main shaft 300 and the motor shaft 210 aresleeved over each other, and the length of the motor 200 may be adjustedaccording to a requirement, to help change torque and power of the motor200, and help improve compatibility of the motor 200.

Specifically, the shaft hole 310 runs through the main shaft 300 alongan axial direction of the main shaft 300, an oil baffle 320 is matchedin the shaft hole 310, the oil baffle 320, an inner circumferential wallof the shaft hole 310 and the motor shaft 210 jointly define an oilstorage cavity 330, the oil storage cavity 330 is filled withlubricating oil, and the oil baffle 320 is provided with an air vent350. In this way, the disposition of the lubricating oil is facilitated,and the lubricating oil in the shaft hole 310 can be effectivelyprevented from leaking, to play a role of protecting a splinelubricating system. In this way, the main shaft 300 may have an oilstorage function, the splines may be lubricated and cooled, the air vent350 may discharge generated gas at the right time, and the dispositionof the shaft hole 310 running through along the axial direction of themain shaft 300 may avoid a case in which gas exists in the shaft hole310 to affect mounting of the motor shaft 210 and the main shaft 300.

More specifically, a seal retainer ring is matched between the oilbaffle 320 and the shaft hole 310 and between the outer circumferentialsurface of the motor shaft 210 and the inner circumferential surface ofthe shaft hole 310. In this way, it is convenient to seal the oilstorage cavity 330, and the lubricating oil in the oil storage cavity330 may be prevented from leaking, thereby improving the seal effect ofthe oil storage cavity 330.

Specifically, as shown in FIG. 2 , the electric assembly 1 furtherincludes a plurality of bearings, and the plurality of bearings arerespectively sleeved over the motor shaft 210 and the main shaft 300 andare spaced apart along the axial direction of the motor shaft 210 andthe main shaft 300. In this way, smooth rotation of the motor shaft 210and the main shaft 300 is facilitated, to help improve reliability andaccuracy of rotation of the motor shaft 210 and the main shaft 300.

According to an embodiment of the present disclosure, as shown in FIG. 8, the plurality of bearings include a first bearing 510, a secondbearing 520 and a third bearing 530, the first bearing 510 and thesecond bearing 520 are respectively disposed adjacent to two ends of themain shaft 300, and the third bearing 530 is disposed adjacent to oneend of the motor shaft 210 away from the main shaft 300. In this way,the disposition of the motor shaft 210 and the main shaft 300 isfacilitated, to further facilitate smooth rotation of the motor shaft210 and the main shaft 300, and the quantity of the bearings may bereduced, to reduce costs of the electric assembly 1.

Specifically, the third bearing 530 is disposed between one end of themotor shaft 210 away from the transmission 400 and the box assembly 100,the first bearing 510 is disposed between one end of the main shaft 300away from the motor 200 and the box assembly 100, and the second bearing520 is disposed between at least one of one end of the motor 200 closeto the main shaft 300 and one end of the main shaft 300 close to themotor shaft 210 and the box assembly 100. In this way, the force appliedto the motor shaft 210 and the main shaft 300 may be more balanced, tohelp improve the operating performance of the electric assembly 1.

In an embodiment, the second bearing 520 is sleeved over the main shaft300 and is located on an overlap between the main shaft 300 and themotor shaft 210 in the axial direction. In this way, the second bearing520 may be used for supporting the main shaft 300 and the motor shaft210, to ensure the disposition reliability of the main shaft 300 and themotor shaft 210. Because the overlap between the main shaft 300 and themotor shaft 210 in the axial direction is a place on which rotationforms stress concentration, effective supporting of the second bearing520 may prevent the main shaft 300 and the motor shaft 210 from beingbroken, thereby improving the operating performance of the main shaft300 and the motor shaft 210.

According to another embodiment of the present disclosure, as shown inFIG. 7 , the electric assembly 1 further includes a fourth bearing 540,where the fourth bearing 540 is sleeved over the motor shaft 210 and islocated between the motor shaft 210 and the motor housing. In this way,the fourth bearing 540 may be used for reinforcing supporting on themotor shaft 210, thereby further improving the disposition reliabilityof the motor shaft 210.

Specifically, the fourth bearing 540 is located between the main shaft300 and a stator of the motor 200 in the axial direction of the motorshaft 210. In this way, the force applied to the main shaft 300 and themotor 200 may be more even, to help improve reliability and stability ofpower transfer between the main shaft 300 and the motor 200.

In an embodiment, as shown in FIG. 11 , an outer surface of the motorhousing 140 is provided with reinforcing ribs 141 arranged along theouter surface of the motor housing 140. In this way, it is convenient toimprove the strength of the motor housing 140, and the surface area ofthe motor housing 140 may be increased, thereby improving the heatdissipation performance of the motor housing 140.

Specifically, after the motor backend cover 150 is dismounted, thetransmission holding cavity 120 may be opened. In this way, it may beconvenient to replace and maintain the transmission 400.

Further, an end face of the motor holding cavity 110 away from one endof the transmission holding cavity 120 may be opened, and after themotor 200 is mounted to the box assembly 100, the motor backend cover150 covers the motor holding cavity 110.

In an embodiment, the motor housing 140 and the motor backend cover 150are mounted through bolts and the front box 180 and the rear box 190 aremounted through bolts. In this way, reliability and stability of thefixed connection between the motor housing 140 and the motor backendcover 150 and between the front box 180 and the rear box 190 may beensured, and when the electric assembly 1 has a fault, the box assembly100 may be quickly dismounted, to further facilitate maintenance of theelectric assembly 1.

Specifically, as shown in FIG. 2 , the first bearing 510 is located onthe motor backend cover 150, the second bearing 520 and the fourthbearing 540 are respectively disposed at two ends of the shaft via-hole130, and the third bearing 530 is located on an end face of the motorholding cavity 110 away from the transmission holding cavity 120. Inthis way, the force applied to the main shaft 300 and the motor 200 maybe more even, to further help improve the structure stability of theelectric assembly 1.

More specifically, the main shaft 300 is provided with a first mainshaft positioning slot and a second main shaft positioning slot, thefirst bearing 510 is matched in the first main shaft positioning slot,and the second bearing 520 is matched in the second main shaftpositioning slot. The motor shaft 210 is provided with a third motorshaft positioning slot and a fourth motor shaft positioning slot, thethird bearing 530 is matched in the third motor shaft positioning slot,and the fourth bearing 540 is matched in the fourth motor shaftpositioning slot. The box assembly 100 is provided with box positioningslots matching the bearings. In this way, the positioning slots may beused for positioning the bearings, to facilitate reliable disposition ofthe bearings, and help improve location accuracy of the bearings.

In an embodiment, the electric assembly 1 can be directly mounted to thechassis of the vehicle 10 through a suspension mounting point on the boxassembly 100. In this way, mounting of the electric assembly 1 isfurther facilitated, improvement of the mounting efficiency of thevehicle 10 is facilitated, and the mounting costs of the vehicle 10 arereduced.

Specifically, as shown in FIG. 6 , the transmission 400 includes adifferential assembly 440, a first gear 410, a second gear 420, a thirdgear 430 and a transmission shaft 450, the first gear 410 is sleevedover the main shaft 300, the second gear 420 and the third gear 430 aresleeved over the transmission shaft 450, the first gear 410 is meshedwith the second gear 420, and the third gear 430 is meshed with thedifferential assembly 440. In this way, it is convenient for thetransmission 400 to implement speed change transmission.

In an embodiment, as shown in FIG. 1 , the box assembly 100 includes thecylindrical motor housing 140 and the front box assembly 180 of thetransmission connected to the motor housing 140, the motor holdingcavity 110 is disposed in the motor housing 140, the transmissionholding cavity 120 is disposed between the front box 180 and the rearbox 190, and the box of the transmission protrudes outward from theouter circumferential surface of the motor housing 140. In this way, itis convenient for the box assembly 100 to protect the electric assembly1.

Specifically, as shown in FIG. 6 , the axial line of the motor shaft 210is parallel to those of the main shaft 300, the transmission shaft 450and the differential assembly 440. In this way, it is convenient for theelectric assembly 1 to smoothly transfer power.

A vehicle 10 according to an embodiment of the present disclosure isdescribed below. The vehicle 10 according to this embodiment of thepresent disclosure includes the electric assembly 1 according to theforegoing embodiment of the present disclosure.

In the vehicle 10 according to this embodiment of the presentdisclosure, the electric assembly 1 according to the foregoingembodiment of the present disclosure is used, where the electricassembly has advantages such as a compact structure and a highintegration level.

Other configurations and operations of the vehicle 10 according to theembodiments of the present disclosure are known to those of ordinaryskill in the art and will not be described in detail herein.

In the description of the present disclosure, it should be understoodthat, orientations or position relationships indicated by terms such as“center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”,“up”, “down”, “front”, “rear”, “left”, “right”, “vertical”,“horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”,“counterclockwise”, “axial”, “radial”, and “circumferential” areorientations or position relationship shown based on the accompanyingdrawings, and are merely used for describing the present disclosure andsimplifying the description, rather than indicating or implying that theapparatus or element should have a particular orientation or beconstructed and operated in a particular orientation, and therefore,should not be construed as a limitation on the present disclosure.Moreover, features modified by “first” and “second” may explicitly orimplicitly include one or more features. In descriptions of the presentdisclosure, “a plurality of” means two or more, unless otherwise stated.

In the descriptions of the present disclosure, it should be noted that,unless otherwise clearly specified and defined, terms such as“mounting”, “interconnection”, and “connection” shall be understood in abroad sense, for example, may be a fixing connection, a detachableconnection, an integral connection, a mechanical connection, anelectrical connection, a direct connection, an indirect connection byusing an intermediate medium, and communication between interiors of twocomponents. A person of ordinary skill in the art may understandspecific meanings of the foregoing terms in the present disclosureaccording to a specific situation.

In the descriptions of this specification, descriptions such asreference terms “an embodiment”, “some embodiments”, “exemplaryembodiment”, “example”, “specific example”, or “some examples” indicatethat specific features, structures, materials, or characteristicsdescribed with reference to embodiments or examples are included in atleast one embodiment or example of the present disclosure. In thisspecification, exemplary descriptions of the foregoing terms do notnecessarily refer to a same embodiment or example. In addition, thedescribed specific feature, structure, material, or characteristic maybe combined in a proper manner in any one or more embodiments orexamples.

Although the embodiments of the present disclosure have been shown anddescribed, a person skilled in the art can understand that the aboveembodiments cannot be construed to limit the present disclosure, andchanges, alternatives, and modifications can be made in the embodimentswithout departing from the principle and the purpose of the presentdisclosure.

What is claimed is:
 1. An electric assembly, comprising: a box assembly,wherein a mounting plate is disposed in the box assembly, the mountingplate divides a space within the box assembly into a motor holdingcavity and a transmission holding cavity that are arranged along anaxial direction of a motor shaft, and the mounting plate has a shaftvia-hole making the motor holding cavity and the transmission holdingcavity be in communication with each other; a motor, wherein the motoris disposed in the motor holding cavity; and a transmission, wherein thetransmission is disposed in the transmission holding cavity, and themotor is power-coupled to the transmission, wherein at least one of asurface of the mounting plate facing the motor and a surface of themounting plate facing the transmission is provided with ribs, the ribscomprise a plurality of strip-shaped ribs extending along a radialdirection of the motor, and heights of at least a part of thestrip-shaped ribs relative to the mounting plate gradually decrease froma center portion of the mounting plate to a periphery portion of themounting plate.
 2. The electric assembly according to claim 1, whereinthe ribs divide a space between the mounting plate and the motor into aplurality of cavities, and a maximum distance between the motor and themounting plate is no more than a preset distance such that the mountingplate cools the motor.
 3. The electric assembly according to claim 2,wherein the maximum distance between the motor and the mounting plate isno more than about 10 mm.
 4. The electric assembly according to claim 2,wherein the maximum distance between the motor and the mounting plate isno more than about 7.5 mm.
 5. The electric assembly according to claim1, wherein the ribs comprise an annular rib extending along acircumferential direction of the motor.
 6. The electric assemblyaccording to claim 1, wherein the strip-shaped ribs are spaced apartalong a circumferential direction of the mounting plate.
 7. The electricassembly according to claim 1, wherein the box assembly comprises atransmission box and a motor box, the transmission box comprises a frontbox and a rear box, the motor box comprises a motor housing and a motorbackend cover, the front box and the motor housing are disposed adjacentto each other, the mounting plate is a part of the front box or a partof the motor housing, and the front box and the motor housing areintegrally formed or detachably connected.
 8. The electric assemblyaccording to claim 7, wherein one or more of a first connection rib, asecond connection rib and a third connection rib are connected betweenan outer surface of the front box and an outer surface of the motorhousing, the first connection rib is connected between an upper end faceof the outer surface of the motor housing and an upper end face of theouter surface of the front box, the second connection rib is connectedbetween a lower end face of the outer surface of the motor housing and alower end face of the outer surface of the front box, and the thirdconnection rib is located between the first connection rib and thesecond connection rib.
 9. The electric assembly according to claim 1,wherein the box assembly comprises a transmission box and a motor box,the transmission box comprises a front box and a rear box, the motor boxcomprises a motor frontend cover, a motor housing, and a motor backendcover, and the mounting plate is a part of the front box or a part ofthe motor frontend cover.
 10. The electric assembly according to claim9, wherein the motor frontend cover and the front box are integrallyformed, and the motor housing and the motor frontend cover aredetachably connected.
 11. An electric assembly, comprising: a boxassembly, wherein a mounting plate is disposed in the box assembly, themounting plate divides a space within the box assembly into a motorholding cavity and a transmission holding cavity that are arranged alongan axial direction of a motor shaft, and the mounting plate has a shaftvia-hole making the motor holding cavity and the transmission holdingcavity be in communication with each other; a motor, wherein the motoris disposed in the motor holding cavity; a transmission, wherein thetransmission is disposed in the transmission holding cavity, and themotor is power-coupled to the transmission; and a bearing, wherein thebearing is sleeved over the motor shaft and is located between the motorshaft and a motor housing.
 12. The electric assembly according to claim11, wherein the bearing is located between a main shaft of thetransmission and a stator of the motor in the axial direction of themotor shaft.
 13. The electric assembly according to claim 12 furthercomprising: a plurality of bearings comprising the bearing, wherein theplurality of bearings are respectively sleeved over the motor shaft andthe main shaft and are spaced apart along the axial direction of themotor shaft, the plurality of bearings comprise a first bearing, asecond bearing, a third bearing, and a fourth bearing, the first bearingand the second bearing are respectively disposed adjacent to two ends ofthe main shaft, the third bearing is disposed adjacent to one end of themotor shaft away from the main shaft, and the fourth bearing is sleevedover the motor shaft and is located between the motor shaft and themotor housing in the axial direction of the motor shaft, and the fourthbearing is located between the main shaft of the transmission and astator of the motor.
 14. The electric assembly according to claim 13,wherein: the third bearing is disposed between the box assembly and oneend of the motor shaft away from the transmission, the first bearing isdisposed between the box assembly and one end of the main shaft awayfrom the motor, the second bearing is disposed between the box assemblyand at least one of one end of the motor shaft close to the main shaftand one end of the main shaft close to the motor shaft, and the secondbearing is sleeved over the main shaft and is located on an overlapbetween the main shaft and the motor shaft in the axial direction of themotor shaft.
 15. The electric assembly according to claim 11, wherein anouter surface of the motor housing is provided with reinforcing ribsarranged along the outer surface of the motor housing.
 16. A vehicle,comprising an electric assembly, wherein the electric assemblycomprises: a box assembly, wherein a mounting plate is disposed in thebox assembly, the mounting plate divides a space within the box assemblyinto a motor holding cavity and a transmission holding cavity that arearranged along an axial direction of a motor shaft, and the mountingplate has a shaft via-hole making the motor holding cavity and thetransmission holding cavity be in communication with each other; amotor, wherein the motor is disposed in the motor holding cavity; and atransmission, wherein the transmission is disposed in the transmissionholding cavity, and the motor is power-coupled to the transmission,wherein at least one of a surface of the mounting plate facing the motorand a surface of the mounting plate facing the transmission is providedwith ribs, the ribs comprise a plurality of strip-shaped ribs extendingalong a radial direction of the motor, and heights of at least a part ofthe strip-shaped ribs relative to the mounting plate gradually decreasefrom a center portion of the mounting plate to a periphery portion ofthe mounting plate.
 17. The vehicle according to claim 16, wherein theribs divide a space between the mounting plate and the motor into aplurality of cavities, and a maximum distance between the motor and themounting plate is no more than a preset distance such that the mountingplate cools the motor.
 18. The vehicle according to claim 16, whereinthe ribs comprise an annular rib extending along a circumferentialdirection of the motor.
 19. The vehicle according to claim 16, whereinthe strip-shaped ribs are spaced apart along a circumferential directionof the mounting plate.
 20. The vehicle according to claim 16, whereinthe box assembly comprises a transmission box and a motor box, thetransmission box comprises a front box and a rear box, the motor boxcomprises a motor housing and a motor backend cover, the front box andthe motor housing are disposed adjacent to each other, the mountingplate is a part of the front box or a part of the motor housing, and thefront box and the motor housing are integrally formed or detachablyconnected.